ionic npm安装报错 no such file ，解决办法

1. Install the latest version of NodeJS from their website (e.g. 6.X.X).
2. Open the Node.js command prompt as administrator.
3. Run: npm cache clean
4. Run: npm uninstall -g ionic
5. Run: npm uninstall -g cordova
6. Run: npm install -g ionic
7. Run: npm install -g cordova